5mm long broad-area lasers at 976nm with 65% wall-plug efficiency

J. Gilly; P. Friedmann; H. Kissel; J. Biesenbach; M. T. Kelemen

doi:10.1117/12.808885

23 February 2009 5mm long broad-area lasers at 976nm with 65% wall-plug efficiency

J. Gilly, P. Friedmann, H. Kissel, J. Biesenbach, M. T. Kelemen

Author Affiliations +

Proceedings Volume 7198, High-Power Diode Laser Technology and Applications VII; 71980B (2009) https://doi.org/10.1117/12.808885
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

Especially for pump applications there is a strong demand for broad-area (BA) diode lasers with high-brightness. Brightness is proportional to output power divided by near and far field widths in both directions. Therefore to achieve a high-brightness broad-area laser, high output power together with high wall-plug efficiencies and a strong reduction of the beam waists in both directions is essential. Whereas fast axis far fields show mostly a current independent behaviour, near- and far-fields in the slow axis suffer from a strong current and temperature dependence, limiting the brightness of broad-area lasers. To fulfill these issues, we have realized MBE grown InGaAs/AlGaAs high-brightness broad-area diode lasers with a resonator length of 5mm and a stripe width of 90μm to guarantee good heat dissipation. The emitting wavelength is 976nm. Single emitters have been mounted p-side down. An output power of 10W has been achieved at 9.8A. A wall-plug efficiency of 65% has been measured. To our knowledge, for a 5mm long device, this is the highest wall-plug efficiency reported so far. To evaluate the brightness of these broad-area lasers, near-fields and far fields in both directions have been carefully investigated. The design of the vertical structure of the broad-area lasers results in a far field angle of 45° in the fast axis (95% power inclusion). In the slow-axis values of 6.5° at 8.5W and 8° at 10W have been demonstrated, which results in a brightness doubled in comparison to state-of-the-art broad-area diode lasers.

Citation Download Citation

J. Gilly, P. Friedmann, H. Kissel, J. Biesenbach, and M. T. Kelemen "5mm long broad-area lasers at 976nm with 65% wall-plug efficiency", Proc. SPIE 7198, High-Power Diode Laser Technology and Applications VII, 71980B (23 February 2009); https://doi.org/10.1117/12.808885

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE